Aren't Carnation's children adopted...and they are legacies. This adoptee tangnet is only gonna cause drama and that's not good
Anyhow, I have no idea what steps are considered, but why would it be different? I understand that you only have two birth parents but the world we know has changed. Divorce is more common and then it follows that step daughters and step mothers etc. will then be more common. I don't think the 'step' legacy connection should be any less valuable than the bio-mother daughter one. It seems disrespectfull toward your sister to devalue her relationship with a daughter.
Inregards to the idea that the step mother could choose if she wanted it to apply, I don't like that. Could a mother do that too if she didn't like her daughter? Sorority values do not get passed on geneticaly, they are taught in life. I just honestly don't get the greater importance to blood relation. It is absurd.
Just my 2c.